Do Magic Eraser only work on white gelcoat? I have white boat w/ black hull. Have a couple deep scratches in black gelcoat that aren't fazed with Meguiars compound for heavy oxidation. Will test a small area next time out.

Do Magic Eraser only work on white gelcoat? I have white boat w/ black hull. Have a couple deep scratches in black gelcoat that aren't fazed with Meguiars compound for heavy oxidation. Will test a small area next time out.